There are 800 dpi horizontally
600 per inch vertical
My eyes must be good, I can count mine.
Try 800
total from left to right and 600
total from top to bottom. (Pixels, not dots per inch)
If you increase it then each Pixel must become smaller to still fit on the screen, so if each Pixel is smaller then it is only logical that each icon displays smaller.
You guys are funny.